So, the oldest fossils are on the bottom layer and the newest fossils are on the top layers.
Scientists know exactly how long it will take for half the quantity of the element to change, and this state is known as its half-life.
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So, when looking at the history of a cliff face, it is important to read the story it tells from the bottom layer up.
The most important are Relative Dating , in which fossils and layers of rock are.
3'- 5’ ﬂ 0/ Think about the process used to construct the layer cake. ‘ ﬂ ’- QB darker brown modern soil in which grass is growing. Notice the fractures (cracks) that cut across the lava ﬂow layer.
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There are some radioactive elements in rock that decay by giving off energy and turning into different, more stable elements.
After another half-life has passed, it will have decayed to an eighth, and so on. Relative dating puts geologic events in chronological order without requiring that a specific numerical age be assigned to each event.